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词条 1212 Francette
释义

  1. Orbit and classification

  2. Physical characteristics

      Rotation period    Diameter and albedo  

  3. Naming

  4. Notes

  5. References

  6. External links

{{Infobox planet
| minorplanet = yes
| name = 1212 Francette
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovery_ref =  
| discoverer = L. Boyer
| discovery_site = Algiers Obs.
| discovered = 3 December 1931
| mpc_name = (1212) Francette
| alt_names = 1931 XC{{·}}{{mp|1949 HB|1}}
1949 HZ{{·}}1965 JB
A918 KA
| pronounced =
| named_after = Francette Boyer [2]
{{small|(discoverer's wife)}}
| mp_category = main-belt{{·}}{{small|(outer)}}
Hilda [4][5]
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 85.98 yr (31,406 days)
| aphelion = 4.7109 AU
| perihelion = 3.1972 AU
| semimajor = 3.9541 AU
| eccentricity = 0.1914
| period = 7.86 yr (2,872 days)
| mean_anomaly = 282.89°
| mean_motion = {{Deg2DMS|0.1254|sup=ms}} / day
| inclination = 7.5898°
| asc_node = 149.58°
| arg_peri = 348.23°
| jupiter_moid = 0.3433 AU
| dimensions = {{val|76.395|0.155}} km[7]
{{val|82.13|3.2}} km[8]
{{val|85.81|2.18}} km[9]
| rotation = {{val|16}} h {{small|(poor)}}[10]
{{val|22.433|0.007}} h[11]{{efn|name=Lightcurve-plot-CS3}}
| albedo = {{val|0.037|0.002}}[9]
{{val|0.0400|0.003}}[8]
{{val|0.040|0.007}}[14]
{{val|0.046|0.007}}[7]
| spectral_type = Tholen {{=}} P {{·}}P [14]
SMASS {{=}} X [4]
B–V {{=}} 0.693
U–B {{=}} 0.215
| abs_magnitude = 9.54[4][8][9]{{·}}{{val|9.62|0.23}}[26]
}}1212 Francette, provisional designation {{mp|1931 XC}}, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 82 kilometers in diameter. It was discovered on 3 December 1931, by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa, who named it after his wife Francette Boyer.[2][28]

Orbit and classification

Francette is a member of the small Hilda family ({{small|001}}),[5] an asteroid family within the dynamical Hilda group,[4] that stays in an orbital resonance with the gas giant Jupiter. It orbits the Sun in the outermost asteroid belt at a distance of 3.2–4.7 AU once every 7 years and 10 months (2,872 days; semi-major axis of 3.95 AU). Its orbit has an eccentricity of 0.19 and an inclination of 8° with respect to the ecliptic.

The asteroid was first observed as {{mp|A918 KA}} at Simeiz Observatory in May 1918. The body's observation arc begins at Algiers with its official discovery observation.[28]

Physical characteristics

In the Tholen classification, Francette is a primitive P-type asteroid. In the SMASS classification it is an X-type asteroid.[4] The Wide-field Infrared Survey Explorer (WISE) also characterizes Francette as a dark P-type,[14] while the overall spectral type for members of the Hilda family is typically that of a carbonaceous C-type.[37]{{rp|23}}

Rotation period

In July 2016, a rotational lightcurve of Francette was obtained from photometric observations by American astronomers Brian Warner, Robert Stephens and Dan Coley at the Center for Solar System Studies ({{small|U80–82}}) in California. Lightcurve analysis gave a rotation period of 22.433 hours with a brightness variation of 0.13 magnitude ({{small|U=2/3-}}), superseding a period of 16 hours, previously measured in the 1970s.[10][11]{{efn|name=Lightcurve-plot-CS3}}

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Francette measures between 76.395 and 85.81 kilometers in diameter and its surface has an albedo between 0.037 and 0.046.[7][8][9][14]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0400 and a diameter of 82.13 kilometers based on an absolute magnitude of 9.54.[4][8]

Naming

This minor planet was named by the discoverer after his wife, Francette Boyer. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 112}}).[2]

Notes

{{notelist|refs={{efn|name=Lightcurve-plot-CS3|1=Lightcurve plot of (1212) Francette by Warner, Stephens and Coley at the CS3 from 5 July to 2 August 2016 rotation period {{val|22.433|0.007}} hours and an amplitude of 0.13 mag. Quality code of 3-. Summary figures at the LCDB}}

}}

References

1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (1212) Francette |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 101 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1213 |chapter = (1212) Francette }}
2. ^1 2 {{cite web |title = 1212 Francette (1931 XC) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1212 |accessdate = 5 January 2018}}
3. ^1 2 3 {{cite journal |display-authors = 6 |first1 = T. |last1 = Grav |first2 = A. K. |last2 = Mainzer |first3 = J. |last3 = Bauer |first4 = J. |last4 = Masiero |first5 = T. |last5 = Spahr |first6 = R. S. |last6 = McMillan |first7 = R. |last7 = Walker |first8 = R. |last8 = Cutri |first9 = E. |last9 = Wright |first10 = P. R. |last10 = Eisenhardt |first11 = E. |last11 = Blauvelt |first12 = E. |last12 = DeBaun |first13 = D. |last13 = Elsbury |first14 = T. |last14 = Gautier |first15 = S. |last15 = Gomillion |first16 = E. |last16 = Hand |first17 = A. |last17 = Wilkins |date = January 2012 |title = WISE/NEOWISE Observations of the Hilda Population: Preliminary Results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...744..197G |journal = The Astrophysical Journal |volume = 744 |issue = 2 |page = 15 |bibcode = 2012ApJ...744..197G |doi = 10.1088/0004-637X/744/2/197 |arxiv = 1110.0283 |access-date= 5 January 2018}}
4. ^1 2 {{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 5 January 2018}}
5. ^1 {{Cite book |first1 = D. |last1 = Nesvorný |first2 = M. |last2 = Broz |first3 = V. |last3 = Carruba |date = December 2014 |title = Identification and Dynamical Properties of Asteroid Families |journal = Asteroids IV |pages = 297–321 |bibcode = 2015aste.book..297N |doi = 10.2458/azu_uapress_9780816532131-ch016 |arxiv = 1502.01628 |isbn = 9780816532131 }}
6. ^1 2 3 4 5 6 {{cite web |title = LCDB Data for (1212) Francette |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1212%7CFrancette |accessdate = 5 January 2018}}
7. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |url = http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |access-date= 5 January 2018}}
8. ^1 2 3 4 5 {{cite journal |first1 = E. F. |last1 = Tedesco |first2 = P. V. |last2 = Noah |first3 = M. |last3 = Noah |first4 = S. D. |last4 = Price |date = October 2004 |title = IRAS Minor Planet Survey V6.0 |url = https://sbn.psi.edu/pds/asteroid/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |journal = NASA Planetary Data System |pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |access-date = 5 January 2018 |archive-url = https://web.archive.org/web/20160603231123/http://sbn.psi.edu/pds/asteroid/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |archive-date = 2016-06-03 |dead-url = yes |df = }}
9. ^1 2 {{Cite journal |first1 = R. C. |last1 = Taylor |first2 = T. |last2 = Gehrels |first3 = R. C. |last3 = Capen |date = September 1976 |title = Minor planets and related objects. XXI – Photometry of eight asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1976AJ.....81..778T |journal = Astronomical Journal |volume = 81 |pages = 778–786.NASA–supportedresearch |bibcode = 1976AJ.....81..778T |doi = 10.1086/111953 |access-date= 5 January 2018}}
10. ^1 2 {{Cite journal |first1 = Brian D. |last1 = Warner |first2 = Robert D. |last2 = Stephens |first3 = Daniel A. |last3 = Coley |date = January 2017 |title = Lightcurve Analysis of Hilda Asteroids at the Center for Solar System Studies: 2016 June-September |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017MPBu...44...36W |journal = The Minor Planet Bulletin |volume = 44 |issue = 1 |pages = 36–41 |issn = 1052-8091 |bibcode = 2017MPBu...44...36W |access-date= 5 January 2018}}
11. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407 }}
12. ^1 {{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 5 January 2018}}
[1][2][3][4][5][6][7][8][9][10][11][12]

}}

External links

  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
  • Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
  • Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
  • {{JPL small body}}
{{Minor planets navigator |1211 Bressole |number=1212 |1213 Algeria}}{{Small Solar System bodies}}{{DEFAULTSORT:Francette}}

7 : Hilda asteroids|Discoveries by Louis Boyer (astronomer)|Minor planets named for people|Named minor planets|P-type asteroids (Tholen)|X-type asteroids (SMASS)|Astronomical objects discovered in 1931
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